CN108660276A - A kind of converter is let cool and secondary blow-in method - Google Patents
A kind of converter is let cool and secondary blow-in method Download PDFInfo
- Publication number
- CN108660276A CN108660276A CN201710196232.2A CN201710196232A CN108660276A CN 108660276 A CN108660276 A CN 108660276A CN 201710196232 A CN201710196232 A CN 201710196232A CN 108660276 A CN108660276 A CN 108660276A
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- China
- Prior art keywords
- furnace
- blowing out
- stove
- lining
- blow
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
It is let cool the present invention relates to a kind of converter and secondary blow-in method, including the smelting process processing after converter blowing out processing, blowing out maintenance processing, the baker of secondary blow-on and process of the start-up processing, secondary blow-on.When blowing out, furnace lining cannot be shown in brick；Blowing out is when stove is without changing furnace bottom operation；Naturally cool stove at room temperature, makes backup lining brick slow cooling；Forbid having leak into stove between the cool furnace period；When blowing out, tapping hole cannot be replaced；According to the damaged part that furnace lining is different after blowing out, using different material for repairing and repairing method maintenance.In the case that the present invention makes the long-term blowing out of magnesia carbon brick material furnace lining converter 72 hours or more or furnace temperature be reduced to environment temperature, backup lining brick is not removed or do not built by laying bricks or stones again, secondary baker, again blow-on are passed through.Ensureing to keep the safety in production, under the premise of meeting technique needs, is reducing the resistance to material cost of steelwork converter, and can dynamically can adjust production capacity at any time.Enable steel mill according to Market Situation, opens at any time, stalls stove.
Description
Technical field
The present invention relates to pneumatic steelmaking field, more particularly to a kind of converter is let cool and secondary blow-in method.
Background technology
The situation that present steel industry faces is severeer.First, the contradiction long-term existence that supply exceed demand, national crude steel production
Can up to 1,200,000,000 tons, and the substantially atrophy of the demand of downstream industry；Fall behind steel production capacity and exits difficult, the conspicuous contradiction of excess capacity
It is difficult to dissolve in a short time, market competition will be fiercer.Second is that steel and iron ore price continuous slide.Third, the whole industry is lost
Aggravation.Therefore, iron and steel enterprise necessarily faces the problem of " go inventory, go production capacity ".And for steel mill, according to market shape
Gesture is opened, stalls stove at any time, and it is specific counter-measure that dynamic, which adjusts production capacity,.But since Converter lining brick is magnesia carbon brick material, at
During type mixture is made knots using containing carbon resin.After long-time blowing out cools, situation especially relatively low in north of china in winter temperature
Under, carbon electrode therein is oxidizable, leads to magnesia carbon brick dusting, peels off, and the safety of iron making production again can not ensure.It can only will be whole
Set backup lining brick dismounting is scrapped, and hundred tons of a set of backup lining bricks of converter weigh more than 300 tons, are worth more than 100 ten thousand yuan, this is steel mill life
It is unaffordable to produce cost.
Invention content
It is let cool technical problem to be solved by the invention is to provide a kind of converter and secondary blow-in method, makes magnesia carbon brick material
The long-term blowing out of furnace lining converter (72 hours or more) or in the case of letting cool (furnace temperature is reduced to environment temperature), is not removed or not again
Build backup lining brick by laying bricks or stones, by secondary baker, blow-on again ensures safety, meet technique needs, carries out to reduce resistance to material cost
The production of new stove labour, can dynamically adjust production capacity at any time.
To achieve the above object, the present invention is realized using following technical scheme：
A kind of converter is let cool and secondary blow-in method, including step in detail below：
Step 1：Converter blowing out is handled
1) when blowing out, furnace lining thickness of slag layer is more than 40mm, and furnace lining cannot be shown in brick；
2) blowing out is when stove is without changing furnace bottom operation；
3) slowly heat dissipation makes backup lining brick slow cooling；
4) forbid having leak into stove between the cool furnace period；
5) when blowing out, tapping hole cannot be replaced；
Step 2：Blowing out maintenance is handled
1) after in-furnace temperature is down to 40 DEG C or less, into stove in check, to furnace lining weakness carry out manual repair；
2) according to the different damaged part of furnace lining, slag line and non-steel face of meeting are repaired using Martin's sand；It is rigid using chromium
Beautiful fire clay is repaired to meeting at steel face contact molten steel；It is contacted to furnace crown and not using the big face gunning refractory of furnace lining and is carried out at molten steel
Repairing；Repairing method uses ramming mode；Ramming number reaches 5 times；With gas toast to 100 DEG C or so after repairing, and keep 4
Hour or more, moisture is excluded, keeps material for repairing sintering abundant；The lining brick for deciding whether more to renew according to the damaged degree of fire door；
Step 3：The baker and process of the start-up of secondary blow-on are handled
1) coke, waste and old wood is used to carry out baker；
2) control of baker overall process baker increasing extent of temperature is controlled in 5~20 DEG C/min, furnace drying time in 100min or more；
Step 4：Smelting process processing after secondary blow-on
1) in blow-on 2-5 stoves, integral tap-hole is replaced；
2) first three stove of blow-on, full iron are smelted；
3) first three stove smelting endpoint temperature of blow-on is less than 1660 DEG C of steel grade.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention makes the long-term blowing out of magnesia carbon brick material furnace lining converter (72 hours or more) or lets cool that (furnace temperature is reduced to environment temperature
Degree) in the case of, backup lining brick is not removed or do not built by laying bricks or stones again, secondary baker, again blow-on are passed through.Ensureing to keep the safety in production, it is full
Under the premise of sufficient technique needs, the resistance to material cost of steelwork converter is reduced, and can dynamically can adjust production capacity at any time.Make
Steel mill can at any time be opened according to Market Situation, stall stove.
Description of the drawings
Fig. 1 is embodiment furnace life comparison diagram.
Specific implementation mode
With reference to embodiment, the present invention is further described：
The present invention will be described in detail for following embodiment.These embodiments be only to preferred embodiment of the invention into
Row description, does not limit the scope of the present invention.
Embodiment
Blowing out when converter lining life 6886, the secondary blow-in method of secondary blow-on baker after blowing out 30 days, including in detail below
Step：
One, converter blowing outs are handled
1. 20 stove before blowing out, it is necessary to assure splash slag effect, when blowing out, furnace lining thickness of slag layer reaches 50mm, and furnace lining cannot be shown in
Brick；Play the role of, by lining brick and air exclusion, preventing magnesia carbon brick oxidation aggravation.
2. blowing out is when stove is without changing furnace bottom operation；
3. slowly heat dissipation makes backup lining brick slow cooling；Lining brick heat shaken stability is deteriorated caused by preventing temperature gradient variation excessive.
4. forbidding having leak into stove between the cool furnace period；Prevent fire resisting magnesia carbon brick from making moist dusting.
5. when blowing out, tapping hole cannot be replaced；
Two, blowing out maintenances are handled
After 1. in-furnace temperature is down to 40 DEG C or less, into stove in check, manual repair is carried out to furnace lining weakness；
2. according to the different damaged part of furnace lining, slag line and non-steel face of meeting are repaired using Martin's sand；It is rigid using chromium
Beautiful fire clay is repaired to meeting at steel face contact molten steel；It is contacted to furnace crown and not using the big face gunning refractory of furnace lining and is carried out at molten steel
Repairing；Repairing method uses ramming mode；Ramming 5 times；With gas toast to 100 DEG C or so after repairing, and keep 4 hours with
On, moisture is excluded, keeps material for repairing sintering abundant；New lining brick is decided not to replace according to the damaged degree of fire door.
The baker and process of the start-up of three blow-ons of bis- times are handled
1. carrying out baker using coke, waste and old wood (refractory brick packaging wood composite pallet).
2. the heating rate for controlling baker by coke addition, oxygen flow, oxygen lance position etc. cannot be excessive, early period is small
Width heats up, and increasing extent of temperature gradually increases.The control of overall process baker increasing extent of temperature exists in 5~20 DEG C/min, furnace drying time control
100min or more.
Smelting process processing after four blow-ons of bis- times
1. in blow-on 2-5 stoves, replacing integral tap-hole；
2. first three stove of blow-on, full iron is smelted；
3. first three stove smelting endpoint temperature of blow-on is less than 1660 DEG C of 45# steel.
After secondary blow-on baker, backup lining brick is still used continuing to be on active service, by each position backup lining brick residual thickness and converter
Annual overhaul plan calculates that furnace life will extend 5500 stove of service life or more up to more than 12500 stoves.Ensureing to keep the safety in production, is meeting technique need
Under the premise of wanting, the resistance to material cost of steelwork converter is reduced, and can dynamically can adjust production capacity at any time.
Claims (1)
1. a kind of converter is let cool and secondary blow-in method, which is characterized in that including step in detail below：
Step 1：Converter blowing out is handled
1) when blowing out, furnace lining thickness of slag layer is more than 40mm, and furnace lining cannot be shown in brick；
2) blowing out is when stove is without changing furnace bottom operation；
3) slowly heat dissipation makes backup lining brick slow cooling；
4) forbid having leak into stove between the cool furnace period；
5) when blowing out, tapping hole cannot be replaced；
Step 2：Blowing out maintenance is handled
1) after in-furnace temperature is down to 40 DEG C or less, into stove in check, to furnace lining weakness carry out manual repair；
2) according to the different damaged part of furnace lining, slag line and non-steel face of meeting are repaired using Martin's sand；It is resistance to using pink fused alumina
Chamotte is repaired to meeting at steel face contact molten steel；It is contacted to furnace crown and not using the big face gunning refractory of furnace lining and is repaiied at molten steel
It mends；Repairing method uses ramming mode；Ramming number reaches 5 times；With gas toast to 100 DEG C or so after repairing, and holding 4 is small
When more than, moisture is excluded, keeps material for repairing sintering abundant；The lining brick for deciding whether more to renew according to the damaged degree of fire door；
Step 3：The baker and process of the start-up of secondary blow-on are handled
1) coke, waste and old wood is used to carry out baker；
2) control of baker overall process baker increasing extent of temperature is controlled in 5~20 DEG C/min, furnace drying time in 100min or more；
Step 4：Smelting process processing after secondary blow-on
1) in blow-on 2-5 stoves, integral tap-hole is replaced；
2) first three stove of blow-on, full iron are smelted；
3) first three stove smelting endpoint temperature of blow-on is less than 1660 DEG C of steel grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196232.2A CN108660276B (en) | 2017-03-29 | 2017-03-29 | A kind of converter is let cool and secondary blow-in method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710196232.2A CN108660276B (en) | 2017-03-29 | 2017-03-29 | A kind of converter is let cool and secondary blow-in method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108660276A true CN108660276A (en) | 2018-10-16 |
| CN108660276B CN108660276B (en) | 2019-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710196232.2A Active CN108660276B (en) | 2017-03-29 | 2017-03-29 | A kind of converter is let cool and secondary blow-in method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184412A (en) * | 2019-06-04 | 2019-08-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of replacement bottom-blowing of converter brick cup |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075075A (en) * | 2001-08-31 | 2003-03-12 | Nippon Steel Corp | Refractory cooling method for refining container |
| CN1908565A (en) * | 2006-08-04 | 2007-02-07 | 河南豫光金铅股份有限公司 | Hot repair method of lead-making furnace body |
| CN102494538A (en) * | 2011-11-24 | 2012-06-13 | 中国铝业股份有限公司 | Process for overhauling of calcining furnace and starting of baking oven |
| CN104673955A (en) * | 2015-03-05 | 2015-06-03 | 山东钢铁股份有限公司 | Shut-down heat preservation method for converter |
| CN104894327A (en) * | 2015-06-10 | 2015-09-09 | 江苏永钢集团有限公司 | Converter slag surface furnace lining fettling method |
-
2017
- 2017-03-29 CN CN201710196232.2A patent/CN108660276B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075075A (en) * | 2001-08-31 | 2003-03-12 | Nippon Steel Corp | Refractory cooling method for refining container |
| CN1908565A (en) * | 2006-08-04 | 2007-02-07 | 河南豫光金铅股份有限公司 | Hot repair method of lead-making furnace body |
| CN102494538A (en) * | 2011-11-24 | 2012-06-13 | 中国铝业股份有限公司 | Process for overhauling of calcining furnace and starting of baking oven |
| CN104673955A (en) * | 2015-03-05 | 2015-06-03 | 山东钢铁股份有限公司 | Shut-down heat preservation method for converter |
| CN104894327A (en) * | 2015-06-10 | 2015-09-09 | 江苏永钢集团有限公司 | Converter slag surface furnace lining fettling method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184412A (en) * | 2019-06-04 | 2019-08-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of replacement bottom-blowing of converter brick cup |
| CN110184412B (en) * | 2019-06-04 | 2021-07-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for replacing bottom blowing brick cup of converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108660276B (en) | 2019-10-29 |
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